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The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
use capitals for proper nouns in other words capitalize the names of people specific places and things for example we don t capitalize the word bridge unless it starts a sentence but we must capitalize brooklyn bridge because it is the name of a specific bridge or the word country would not normally be capitalized but we would have to write china with a capital c because it is the name of a specific country or the word state while not normally capitalized would be written with a capital if it is in the name of an organization such as the state board of education